| 摘要 |
PROBLEM TO BE SOLVED: To detect rotor position immediately after commutation by comparing a first information signal pattern with a second information signal pattern and a third information signal pattern through an information signal pattern comparing means, and outputting a circulating current disappearance signal. SOLUTION: When a first information signal pattern is identical to a third information signal pattern and a second information signal pattern is different from other two information signal patterns, a circulation current is generated immediately after communication and disappears. Consequently, disappearance of the circulation current can be detected by comparing the first, second and third information signal pattern through an information signal pattern comparing means 6g and outputting a circulation current disappearance signal 14. Consequently, rotor position can be detected immediately after commutation based on an information signal pattern 13 generated from an information signal generating means 9 after detecting disappearance of the circulation current. |
